Could be several things. The one that comes to mind is low calcium levels.
A spasm.sedimentarySpasm
sarcoplasmic reticulum
sarcopenia but not eating is also a big thing not eating can cause muscle spasms i had one in class
Cataplexy syndrome is when a person experiences sudden muscle weakness. This can cause uncontrollable laughing, crying, terror, and many other things.
The sudden change in a gene is called a mutation.
cramps
A spasm.sedimentarySpasm
A Cramp or a Sprain
It's called a "cramp".
instant movement
A cramp is a sudden over-shortening of a muscle. Cramps are involuntary and, often, severe. They can be extremely painful.
It is called a Tracheospasm
A muscle spasm is a sudden, spontaneous, uncontrollable and abnormal tightening or contraction of a muscle. The term muscle cramp is also used to describe a muscle spasm anywhere in the body, and when a muscle spasm occurs in the lower leg it is often called a "charlie horse." Spasms of the muscles will often be triggered after a sudden movement in a muscle that has not been used for a while, even if the movement is not forceful. Examples of this are muscle cramps that happen while asleep or after prolonged sitting. This is why athletes do warm up exercises before activity to prevent muscle spasm. Muscle spasms are not uncommon, and can become more frequent and intense with age, when fatigued as from overwork, or when the mineral levels of the body are lower than normal for normal muscle function. This is why athletes and those who work in high temperatures take salt tablets or drink fluids to replace the minerals that are lost from excess sweating.
MalNutrition
spasmodic is an adjective derived from the word spasm which is a noun.spasm : a muscle cramp; a painful and involuntary muscular contraction.spasmodic: relating to, affected by, or having the character of a spasm; fitful; convulsive; excitable with sudden outbursts of energy; happening intermittentlyexample:An overexerted and tired muscle can be spasmodic if it repeatedly has spasms.
Angiospasm is sudden contraction of a blood vessel. In contrast, vasoconstriction is the normal process of contraction of a blood vessel.VasoconstrictionAngiospasm
Muscle cramps and muscle spasms are both symptoms of a sudden, involuntary contraction of a muscle or group of muscles. They can be painful and can last from a few seconds to several minutes. Muscle cramps are most common in the legs, especially the calves, but they can occur in any muscle in the body. Muscle spasms can also occur in any muscle in the body, but they are more common in the back and neck. The symptoms of muscle cramps and muscle spasms are similar, but there are a few key differences. Muscle cramps are typically more painful and can be accompanied by a visible bulge in the affected muscle. Muscle spasms are typically less painful and may not be accompanied by a visible bulge. Muscle cramps and muscle spasms can be caused by a number of different things, including: Dehydration Electrolyte imbalance Muscle fatigue Overuse of the muscle Holding a position for too long Certain medical conditions, such as diabetes, kidney disease, and thyroid disorders Certain medications Pregnancy If you experience muscle cramps or muscle spasms on a regular basis, it is important to see a doctor to rule out any underlying medical conditions. Here are some tips for relieving muscle cramps and muscle spasms: Gently stretch the affected muscle. Massage the affected muscle. Apply heat or ice to the affected muscle. Drink plenty of fluids. Rest the affected muscle. If the muscle cramp or muscle spasm is severe or does not go away after a few minutes, seek medical attention.